BILL Clinton helped Alan Colmes on his upcoming book, "Red, White, and Liberal" (ReganBooks), after Colmes sent him the chapter titled "Bill Clinton, Our Greatest President." Clinton responded with some suggestions, claiming the Brady Law made it harder for felons to buy guns and boasting how he got more poor kids covered by Medicare. Colmes' book (in stores Oct. 21) also features chapters entitled "Jesus Was a Liberal" and "Conservatives Are Downright Mean." (PageSix)